te Museum (NSM); and to those in charge of the
collections of the Nebraska Game, Forestation and Parks Commission
(NGFPC). Specimens from the Museum of Natural History, University
of Kansas (KU), also have been used.

Capitalized color terms are those of Ridgway, Color Standards and
Color Nomenclature, Washington, D. C., 1912. Assistance with field
work to obtain specimens for the University of Kansas Museum of
Natural History is acknowledged from the Kansas University
Endowment Association and the National Science Foundation.

=Perognathus fasciatus fasciatus= Wied-Neuwied

_Perognathus fasciatus_ Wied-Neuwied, Nova Acta Phys.-Med. Acad.
Caesar. Leop.-Carol., 19:369, 1839, type from Upper Missouri
River near its junction with the Yellowstone, near Buford,
Williams County, North Dakota.

_Geographic distribution._--Southwestern Manitoba, extreme
northeastern Montana and all of North Dakota except extreme eastern
part, south through central South Dakota to the northeastern part
of Cherry County, Nebraska (see Figure 1).

_Remarks._--For comparisons with _Perognathus fasciatus
olivaceogriseus_, geographically adjacent to the southwest, see account
of that subspecies.

Specimens from the eastern part of the range of _P. f. fasciatus_ are
somewhat smaller and slightly darker than topotypes from Buford, North
Dakota. Specimens from 9 mi. SE Bainville, Johnson Lake and 3 mi. S
Medicine Lake, Montana, and from Crosby, North Dakota, are also paler
than those from farther east. At the southern limit of the range of the
subspecies, specimens from the Rosebud Agency and Minichaduza River,
South Dakota, approach _olivaceogriseus_ in pale dorsal coloration.

_Specimens examined._--Total number, 83, as follows: MANITOBA:
Aweme, 3 (USBS 2, NMC 1). Junction of Antler and Souris rivers, 1
(NMC). Oak Lake, 2 (NMC). MONTANA: _Roosevelt County_: 9 mi. SE
Bainville, 4 (MZ); Johnson Lake, 2 (USBS). _Sheridan County_: 3 mi.
S Medicine Lake, 1880 ft., 1 (KU). NEBRASKA: _Cherry County_: Ft.
Niobrara Game Reserve, 1 (NSM); Sparks, 1 (MZ); Valentine, 2
(UNDZ). NORTH DAKOTA: _Benson County_: 2 mi. W Fort Totten, 1400
ft., 3 (KU). _Bottineau County_: Bottineau, 1 (CNHM). _Burleigh
County_: 9 mi. E Bismark, 7 (MZ). _Dickey County_: Oakes, 2 (CNHM
1, USBS 1). _Divide County_: Crosby, 1 (USBS). _Kidder